Blood pump

a centrifugal pump and pump body technology, applied in the field of centrifugal pumps, can solve the problems of pulsation-type artificial heart limited to applications, miniaturization of pulsation-type artificial heart, and not be the same as the following two problems

Inactive Publication Date: 2005-04-26
HITMAC USA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0042]When the curvature radius of the bearing surface of the pivot bearing section is set to substantially two times or more of the curvature radius of the pivot of the impeller rotation shaft, the pivot shaft of the impeller titubates an...

Problems solved by technology

As important problems for the practical use of artificial heart, first, we can name the prevention of thrombosis from occurring in the artificial heart.
In addition, improvement of durability of artificial heart is also an essential problem to be resolved for the practical use thereof.
Nonetheless, it is difficult to miniaturize the pulsation type ...

Method used

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Embodiment Construction

[0048]Embodiments of the invention of the application shall be described based on drawings. FIG. 1 is a longitudinal section view of a blood pump according to one embodiment.

[0049]In the drawing, 1 represents a conical shape impeller, 2 a casing rotatably encasing the impeller, 3 a magnetic driving means placed under the casing 2, and 4 a magnetic attraction force adjustment means interposed between the casing 2 and the magnetic driving means 3. An outlier portion 38 of impeller 1, casing 2 and magnetic driving means 3 is formed of pure titanium or titanium alloys such as Ti4A16V, organic compatible materials, and furthermore, potions in contact with blood such as face side surface of the impeller, inner wall section of the casing 2 or others has a polished surface presenting a roughness equal or inferior to 0.2 μm in order to control the adhesion of platelet.

[0050]A side section 11 of the impeller 1 is provided with vanes 13, for discharging from a delivery outlet 25 blood flowing ...

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Abstract

It is an object of the present invention to realize a small and light blood pump that can control thrombosis and moreover, endure a prolonged use.
A blood pump comprising an impeller, a casing having a suction inlet and a delivery outlet and rotatably encasing the impeller, a magnetic drive means for rotating the impeller by magnetically acting from outside of the casing on a magnet that the impeller includes, a magnetic attraction force adjustment means for adjusting the attraction force by said magnetic action, a control means for rotating speed of said magnetic drive means, and a pair of pivot bearings for supporting pivots at both ends of the impeller rotation shaft, wherein the distance between bearing faces of said both pivot bearings is set longer than the length of the rotation shaft of the impeller and the rotation speed of the impeller is controlled to a predetermined speed by said control means for rotating speed so as to levitate the impeller in the blood flow in the casing and to maintain out of contact between the pivots at both ends of the rotation shaft of the impeller and the bearing face of said both pivot bearing.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention concerns a blood pump used for artificial heart-lung machine or the like, and more particularly, a centrifugal pump that can be operated with the rotation shaft out of contact in respect to the bearing by controlling the rotating speed.[0003]2. Detailed Description of the Prior Art[0004]Recently, studies for replacing or complementing a malfunctioning internal heart with an artificial heart have been conducted vigorously in Japan and abroad in past several decades. As important problems for the practical use of artificial heart, first, we can name the prevention of thrombosis from occurring in the artificial heart. In addition, improvement of durability of artificial heart is also an essential problem to be resolved for the practical use thereof.[0005]Initially, the research and development of artificial heart have been conducted mainly for pulsation type pumps such as bellows pump or the like havi...

Claims

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Application Information

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IPC IPC(8): A61M1/10A61M60/178A61M60/232A61M60/419A61M60/825
CPCA61M1/101A61M1/1036A61M1/1017A61M60/824A61M60/419A61M60/148A61M60/232A61M60/178A61M60/825
Inventor NOSE, YUKIHIKOICHIKAWA, SEIJISHINOHARA, TOSHIYUKI
Owner HITMAC USA
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